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Ford 9N, 2N & 8N Discussion Board

12v conversion - now hard/no start when cold - ytmag kit


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Posted by Wade C on January 10, 2013 at 12:46:36 from (199.91.130.252):

Got the 12v conversion for a 6v front distributor 8N for the YTMag store.

Aside from the belt being too short, and the directions not explaining if or when you do or dont need the second resistor - the install was easy.

When I emailed them about the belt and the resistor, I got told to use the resistor, and that I must have the bracket wrong. So used the resistor in the wiring as the instructions said, and the bracket was also as the instructions said. Replied about the belt, and no response... so just got a longer belt and put it together and all is fine.... except the cold starting... its fine when it was in the heated shop, but after being outside for overnight... just light hits when cranking but would never light up.

Decided to bypass the second resistor (leaving the OE resister in line), and fired right up. Ran it a minute or three, and then shut down, reconnected the second resistor and started it back up to run. Took some cranking to get going again, but did light and run.

So in my head, (understanding that the resistor is to limit current as it gets warmer) and with it being cold and not starting with the two resistors, and starting with just the one... I am left wondering about the overall setup and how to make it as reliable as when it was 6volt - slow but reliable....

The email I got when asking about the resistor stated that they could not tell me why I would need it or how it was designed to function, but that the "instructions called for the resistor". I dont expect everyone there to be a mechanic... but considering the time it took for that reply, and never hearing back on the belt, I wasnt to optimistic about starting there first... and there is such a wealth of knowledge here.

Despite the instructions clearly saying "IF the resistor is used" - wire it this way - if not, wire it that way - but having no explanation of why it would or wouldnt be used... I was a bit curious about the design of the "kit". Why would a new "12v coil" require two resistors? Why not just one that either replaces the old in the OE spot, or omit that resistor and just use the one? Just struck me as odd.

Now that it wont start cold, but will if the second resistor is bypassed, Im left thinking there must be a reason the instructions said "IF" when it came to wiring in the second resistor - and what that reasoning is.

I could easily wire in a bypass switch so if needed, it would bypass the second resistor while starting and then go back to the two in series once running, but this is my dads tractor, and he isnt all that mechanical, and if that second resistor being bypassed would kill the coil if forgotten (heck might just using intermittently?), I cant do that - and would rather keep it "normal" because its an hour and half drive there to go "fix it" for him.

So anyone know the scoop behind this YTMag kit, and the story with the resistor? Thoughts on the best way to get this squared away? Would like to fix it right before I take it back to him (had it here replacing a valve and a tune up).

Thanks in advance.

Wade


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